Product Description

Stainless Steel Countersunk Square Neck Bolts

Our Stainless Steel Countersunk Square Neck Bolts are specially designed fasteners with a flat countersunk head and a square neck under the head. The countersunk head allows the bolt to sit flush with the surface after installation, while the square neck helps prevent the bolt from rotating during tightening.

These bolts are ideal for applications where a smooth surface, strong fastening, and anti-rotation performance are required. They are commonly used in machinery, wood structures, metal assemblies, furniture, agricultural equipment, construction, and custom fastening projects.

Made from stainless steel, these bolts provide good corrosion resistance, durability, and a clean appearance, making them suitable for indoor, outdoor, and general industrial use.

Key Features

• Countersunk flat head design for flush surface installation.
• Square neck under the head helps prevent rotation during tightening.
• Stainless steel material provides good corrosion and rust resistance.
• Metric thread design, commonly available in M6 and custom sizes.
• Suitable for wood, metal, machinery, furniture, and equipment assembly.
• Clean surface appearance after installation.
• Strong fastening performance with matching nuts and washers.
• Custom length, material, and size available according to customer requirements.

Product Specifications

Size Chart

Unit: mm

Drawing Parameter Explanation

What Is a Countersunk Square Neck Bolt?

A countersunk square neck bolt is a special bolt with two important design features:

When the bolt is inserted into a pre-drilled hole or square recess, the square neck locks into the material. This makes installation easier because the bolt does not rotate when the nut is tightened from the other side.

Common Applications

Material Advantages

Stainless steel countersunk square neck bolts are suitable for applications requiring corrosion resistance and a clean finish.

For general use, 304 stainless steel is a practical choice. For marine or highly corrosive environments, 316 stainless steel is recommended.

Product Advantages

These Stainless Steel Countersunk Square Neck Bolts provide both functional fastening and a clean finished appearance. The flat head helps reduce surface protrusion, while the square neck improves anti-rotation performance during installation.

They are especially useful when the bolt head side is difficult to hold with a tool or when the surface needs to remain smooth after assembly. With stainless steel material, they offer reliable durability and corrosion resistance for many different industries.

Installation Notes

Before ordering, please confirm the following details:

For correct installation, the square neck should match the hole or recess design. This helps prevent rotation and improves fastening stability.

Matching Products

Preguntas frecuentes

Q1: What is a countersunk square neck bolt?

A countersunk square neck bolt is a bolt with a flat countersunk head and a square neck under the head. The head sits flush with the surface, and the square neck helps prevent rotation.

Q2: What material are these bolts made from?

They are made from stainless steel. Common options include 304 stainless steel and 316 stainless steel.

Q3: What size is available?

The size shown is M6, with a standard pitch of 1.0 mm. Other sizes can be customized according to drawings or samples.

Q4: What is the function of the square neck?

The square neck locks into the material or hole and prevents the bolt from spinning when the nut is tightened.

Q5: What is the function of the countersunk head?

The countersunk head allows the bolt head to sit flat or nearly flush with the surface, creating a smooth and clean appearance.

Q6: Can these bolts be used in wood?

Yes. They are suitable for wood assembly, timber structures, furniture, and other wood-to-metal or wood-to-wood fastening applications.

Q7: Can these bolts be used outdoors?

Yes. Stainless steel provides good corrosion resistance and can be used outdoors. For marine or highly corrosive environments, 316 stainless steel is recommended.

Q8: Do these bolts need matching nuts?

Yes. These bolts are usually used with matching metric nuts. Flat washers, spring washers, or lock nuts can also be used depending on the application.

Q9: Can the length be customized?

Yes. Length, material, head size, thread length, and packaging can be customized according to customer requirements.

Q10: Are these bolts the same as carriage bolts?

They are similar to carriage bolts because both have an anti-rotation neck design. However, this product uses a countersunk flat head, while common carriage bolts usually have a round head.